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Driving circuit and touch display device

a technology of driving circuit and touch display device, which is applied in the direction of instruments, computing, electric digital data processing, etc., can solve the problems of increasing power consumption and chip size, and achieve the effect of reducing the size of the driving circui

Active Publication Date: 2018-05-03
LG DISPLAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention aims to provide a driving circuit and a touch display device that can perform display and touch driving while minimizing the size of the driving circuit. Additionally, the invention seeks to reduce noise in touch sensing data and increase the accuracy of touch sensing data by using multiple channels within the driving circuit for receiving touch sensing signals. This results in a more compact device and improved user experience.

Problems solved by technology

Therefore, there is a problem that the chip size and the power consumption are increased by the driving circuit disposed for performing each of the display function and the touch sensing function, and there are many difficulties in designing driving circuits and a channel of each driving circuit in a small-sized display device, such as a mobile display device.

Method used

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  • Driving circuit and touch display device
  • Driving circuit and touch display device
  • Driving circuit and touch display device

Examples

Experimental program
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first embodiment

[0090]FIG. 4 illustrates a structure of the driving circuit 300 in a touch display device 100 according to the present embodiments.

[0091]Referring to FIG. 4, an example of a structure of one of the plurality of switched capacitor gain amplifier groups SC-GA Group 310 included in the driving circuit 300 is shown.

[0092]The switched capacitor gain amplifier group SC-GA Group 310 may include a plurality of amplifiers having input terminals electrically coupled with the digital-to-analog converter DAC and output terminals electrically coupled with the data lines DL, and a feedback capacitor Cfb electrically coupled with a touch sensing line TSL.

[0093]The output terminals of the respective amplifiers may be electrically coupled with the data lines DL through switches that electrically couple to the output terminals in a display driving period, and may be electrically coupled with the analog-to-digital converter ADC in a touch driving period.

[0094]Specifically, switches Std1, Std2, Std3, S...

second embodiment

[0120]FIG. 7 illustrates a structure of the driving circuit 300 in a touch display device 100 according to the present embodiments.

[0121]Referring to FIG. 7, in the driving circuit 300 according to the second embodiment, each switched capacitor gain amplifier group SC-GA Group 310 may include a plurality of amplifiers having input terminals electrically coupled with the digital-to-analog converter DAC and output terminals electrically coupled with the data lines DL, and a feedback capacitor Cfb electrically coupled with a touch sensing line TSL.

[0122]Further, output terminals of the respective amplifiers may be electrically coupled with the data lines DL through switches that electrically couple to the output terminals in a display driving period, and may be electrically coupled with the analog-to-digital converter ADC in a touch driving period.

[0123]At this time, the amplifiers included in one switched capacitor gain amplifier group SC-GA Group 310 have respective switches Sfb1, Sf...

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Abstract

A touch display device and a driving circuit are disclosed in which the driving circuit is included in the touch display device. The driving circuit may be capable of reducing a chip size and power consumption by configuring an amplifier disposed in an output terminal of a data voltage to be electrically coupled with a feedback capacitor through a switch, and enabling both display driving and touch sensing to be performed through ON / OFF control of the switch. Further, the accuracy and performance of touch sensing may be improved by adjusting an ON / OFF operation of a switch and the number of amplifiers electrically coupled with the feedback capacitor, and a circuit structure for touch driving may be further simplified by generating a load-free driving voltage output in a touch driving period using the amplifiers and a digital-to-analog converter within the driving circuit.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application claims priority from Korean Patent Application No. 10-2016-0143752, filed on Oct. 31, 2016, which is hereby incorporated by reference for all purposes as if fully set forth herein.BACKGROUNDTechnical Field[0002]The present embodiments relate to a touch display device and a driving circuit included in the touch display device.Description of the Related Art[0003]As the information society develops, various demands for a display device that displays an image are increasing, and various types of display devices, such as a liquid crystal display device, a plasma display device, and an organic light emitting display device, have come to be utilized.[0004]These display devices have recently been provided with a touch sensing function for recognizing a user's touch on a display panel and performing input processing in response to the recognized touch, for the convenience of the user using the display devices and in order to provid...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G06F3/041G06F3/044G06F3/047
CPCG06F3/0412G06F3/044G06F3/047G06F2203/04112G09G3/20G09G2310/0291G09G2310/0297G09G2320/029G09G2310/027G06F3/04182G06F3/04184G06F3/04186G06F3/0446G06F2203/04111G06F2203/04106G06F3/0416
Inventor KANG, HYEONGWONKIM, BEOM-JINLEE, HONGJU
Owner LG DISPLAY CO LTD